n LOS ANGELES -- The blood type of samples recovered at the scene of a brutal double slaying match that of O.J. Simpson's blood, a potentially important piece of evidence in the investigation of the killings of the football star's former wife and a man she knew, Los Angeles police sources said. Simpson's blood type is different from those of the two victims, Nicole Brown Simpson and Ronald Lyle Goldman, a source said Wednesday. Any discovery of Simpson's blood type at the murder scene could lend credence to the suggestion that he was there, sources said. Although sources have said Simpson is the main suspect in the investigation, the Los Angeles Police Department has declined to confirm those reports, and Simpson has not been arrested, much less charged with any crime.